METHOD FOR PREPARING SELENOPYRILIUM SALTS Russian patent published in 2006 - IPC C07D345/00 

FIELD: chemical technology.

SUBSTANCE: invention relates to the improved method for preparing selenopyrilium salts by interaction of 1,5-diketones with hydrogen selenide that is prepared in dissolving zinc selenide in mixture of acetic acid, hydrogen bromide and diethyl ether. The reaction medium is prepared by addition of acetic acid bromoanhydride to mixture of diethyl ether and hydrogen bromide an aqueous solution. The following indices of compounds are given below as, name, empirical formula, melting point and the yield of the end product, %, respectively: 2,4,6-triphenylselenopyrilium bromozincate, C₂₃H₁₇SeZnBr₃, 256-258°C, 75; 2,6-diphenyl-4-(p-methoxyphenyl)-selenopyrilium bromozincate, C₂₄H₁₉SeOZnBr₃, 247-252°C, 71; 2,6-diphenyl-4-methylselenopyrilium bromozincate, C₁₈H₁₅SeZnBr₃, 205-207°C, 68. All prepared salts have been converted to the corresponding perchlorates. Method provides excluding the use of gaseous hydrogen selenide.

EFFECT: improved preparing method.

2 cl, 3 ex